tsiege

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!






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vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

jcataluna

#!/bin/bash

mkdir -p out

for img in `grep image $1| sed -e 's/^.*image\: //g'`;
do
    cleanname=${img/\//-}
    tag=`docker images | grep $img | awk '{print $2}'`
    echo "Exporting image: $img, tag:$tag ($cleanname)..."
    docker save $img -o out/$cleanname.tar

lg

#!/bin/ash
#
# angry_wifi.sh
#
# auto disconnects clients with a low signal strength on LEDE / OpenWRT. great
# for clients who hold onto a lower-signal-strength accesspoint instead of
# roaming. before running, make sure to download the latest MAC addresses with:
#
#   wget --no-check-certificate -O - 'https://services13.ieee.org/RST/standards-ra-web/rest/assignments/download/?registry=MAC&text=apple' | cut -d, -f2 > apple_mac_addresses
#

nikhita

How to update the Go version

System: Debian/Ubuntu/Fedora. Might work for others as well.

1. Uninstall the exisiting version

As mentioned here, to update a go version you will first need to uninstall the original version.

To uninstall, delete the /usr/local/go directory by:

danyanya

# One line JS code to check MongoDB collection storageSize

var collectionNames = db.getCollectionNames(), stats = []; collectionNames.forEach(function (n) { stats.push(db.getCollection(n).stats()); }); stats = stats.sort(function(a, b) { return b['storageSize'] - a['storageSize']; }); for (var c in stats) { print(stats[c]['ns'] + ": " + stats[c]['size'] + " (" + stats[c]['storageSize'] + ")"); }

samdoran

Aerohive

Initial setup

1. Reset to factory defaults

    reset config bootstrap
    reset config
   

   The username is admin and the password is aerohive or Aerohive1.